[antlr-interest] gUnit for v4?
oliver.zeigermann at gmail.com
Sun Apr 15 14:54:36 PDT 2012
Correct! Both statements :)
Am 15.04.2012 23:44 schrieb "Terence Parr" <parrt at cs.usfca.edu>:
> Ah. I see that "Dr. Simplify" still awake in Germany. :)
> On Apr 15, 2012, at 2:40 PM, Oliver Zeigermann wrote:
> > +1
> > Am 15.04.2012 23:36 schrieb "Terence Parr" <parrt at cs.usfca.edu>:
> >> Hi,
> >> I started down the path of building the new version of gUnit for v4, but
> >> I'm beginning to question its value for the new version. Because I am
> >> pooh-poohing putting actions directly within a grammar, grammar can only
> >> yield parse trees. and looks nice to be able to say:
> >> expr:
> >> "1" -> (expr 1)
> >> "1+2" -> (expr (expr 1) + (expr 2))
> >> but so what? all that did was confirm that the parser generated by ANTLR
> >> works correctly. it's not telling you anything you didn't know by
> >> at the grammar.
> >> In the old days we used to build ASTs and so we needed to check the
> >> structure. That need is no longer here. Also, these rules don't generate
> >> output and so we can't check input to output translation.
> >> What it comes down to is this: we really need functional testing not
> >> testing for language applications, unless of course each rule returns a
> >> string that the translation of the input some phrase or something. But,
> >> it's just as easy to write calls to assertEquals() saying that input x
> >> should yield input y. If we are doing something other than generating
> >> output, such as building up a data structure, then we really do need to
> >> manually check that the data structure is solid given some input.
> >> I'm trying to find a flaw in my logic. Is there something I'm missing
> >> about testing grammars? In v4, they will give you exactly what you want,
> >> unless there is a bug in ANTLR. But that's my problem not yours.
> >> If we can't find a major benefit, then we should avoid introducing
> >> moving part to the ANTLR ecosystem.
> >> Ter
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